I have recently reinstalled Mac osx and updated logic 9, now have problems with midi controllers/channels. This is the method I use; 1. Set external controllers to different midi channels; ch.1 & ch.2. 2. Set the Logic Software Instruments midi channels to match external controller channels ( i.e ch.1&2 ). 3. Logic Settings -> Recording and enable "Autodemix by midi channel if multitrack recording" which will switch Logic into a "live play" mode. 4. Arm the tracks of the Software Instruments to audition or record. I have booted with the old OS from external HD, and this method works fine. Any ideas why it's not working on the new install? I have tried the channel splitter method for 2 midi controllers and it still works.